In the first half you will find sections covering Fundamentals of Design, Dimensioned Designs for Cylinders and Valve Gears, Design of Boilers, and Handling Model Locomotives - these being anything from 0 Gauge up to 15-inch gauge. The other half of this book is used to describe twenty locomotive designs, from a simple 0 gauge 0-4-4 tank locomotive to seven Gauge 1 locomotives, three 21⁄2-inch gauge, two 31⁄2-inch gauge, three 5-inch gauge and two 71⁄4-inch gauge locomotives, and two 15-inch gauge designs. Some of these are likely to surprise the historians as it would appear that Greenly was the first to design models of certain well know locomotives, and other appear re-scalled and re-named; his 5-inch gauge 'Halton Tank' appears here in 71⁄4-inch gauge. And this book must be the first appearance of the Gaue 1 'Project' single-cylinder layout.
Not only does this book contain a wealth of useful design information, it reveals just how good and versatile Greenly was; no other designer covering such a wide range of gauges or scales.